package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.text.DateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author scx
 * @since 2025-1-19
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone) {
        // 发送短信验证码并保存验证码
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        String code = RandomUtil.randomNumbers(6);
        log.info("发送验证码：{}", code);
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code);
        stringRedisTemplate.expire(RedisConstants.LOGIN_CODE_KEY + phone, RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm) {
        // 实现登录功能
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }

        String code = loginForm.getCode();
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        if (cacheCode == null || !cacheCode.equals(code)) {
            return Result.fail("验证码错误");
        }

        User user = query().eq("phone", phone).one();
        if (user == null) {
            user = createUserWithPhone(phone);
        }

        //保存用户信息到redis
        String token = UUID.randomUUID().toString(true);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = new HashMap();
        userMap.put("id", userDTO.getId().toString());
        userMap.put("nickName", userDTO.getNickName());
        userMap.put("icon", userDTO.getIcon());

        stringRedisTemplate.opsForHash().putAll(RedisConstants.LOGIN_USER_KEY + token, userMap);
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
//        获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        int count = 0;
        while (true) {
            if ((num & 1) == 0) {
                break;
            } else {
                count++;
            }
            num = num >>> 1;
        }
        return Result.ok(count);
    }

    /**
     * 根据手机号创建新用户
     *
     * @param phone
     * @return
     */
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName("用户：" + RandomUtil.randomString(10));
        user.setCreateTime(LocalDateTime.now());
        user.setUpdateTime(LocalDateTime.now());
        save(user);
        return user;
    }
}
